Same problem here... After upgrading to kernel 2.6.16 on Debian Ctrl+Alt+Fn started crashing kdm with:

Quote:

kdm[5311] X server for display :0 terminated unexpectedly

I get a moments black screen in an attempt to switch modes followed by an X server reset (as if I had pressed Ctrl+Alt+Bksp). Doesn't matter if I'm logged on to X or not (meaning it holds true for the log on screen). Strangely it will go to a text terminal if Alt+N (Terminal login) is specified at log on.

I was using the same driver version prior to the kernel upgrade, there was no problem then.